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chitarra classica

Classical Guitar (6 & 10 strings)

I can use these strings

Aquila Alabastro Chitarra Classica


Aquila Perla Chitarra Classica



Ambra 2000®


10  strings Yepes tuning

aquila strings rubino series

Rubino series


10  strings baroque bass tuning



By chances, are you one of those who thinks that the six guitar strings have all the same working tension?


Contrary to what may seem settings for classical guitar does not follow at all an equal tension profile between the strings.

In this graph is shown, for example, the working tension of a few sets of strings of different companies:
Profilo di tensione delle sei corde in cinque differenti marche

                                                                                                           Tension profile of the six strings of five different brands



The most common method of assessing the degree of tension of the strings of a guitar is to press them with the fingers of the right hand near the bridge: a setting is judged well done when all the strings oppose the same force of contrast to the finger pressing. It would therefore be concluded that were all calculated with the same working tension.

But this type of evaluation is actually a ‘tactile feel’ of the tension, not the real tension in kg -or pounds- measurable with proper tools.

For a law of physics, two strings that produce the same lateral displacement under the same weight and in the point where it exerts the force application (which is in practice imitate the finger pressure) also have the same tension in Kg, but this equal tension does not match, however, with the one that is set in the calculation necessary to determine the diameters of string as nowdays all we do.

The reason is simple: in a state of traction, strings stretch, (this is evident in particular in turnings imparted to the string during tuning); this consequently entails also a progressive reduction of their gauge.

But if the diameter is also reduced the working tension will suffer a proportional decrease compared to the original one determined by calculation.

The stretching is not the same for all of the strings; it is maximum for the treble, a bit less for the second string and much less for the third: it is known that all the turnings of the mechanics to be applied to treble are much more than those necessary to the third string. Consequently, a setting that had been calculated in equal tension once placed in a state of intonation would become completely unbalanced.

This fact is unavoidable: a guitar in fact not only employs strings of heterogeneous physical nature (the first three are synthetic monofilament; bass instead are composed of two materials coupled to each other as burr synthetic and wire coating) but also of different diameter and being in the instrument in a specific position that is defined by the technicians ‘Working Index’ (which is the product between the frequency of the string and the string length).

All this means that the achievement of a homogeneous tactile tension between the strings is in reality a fact more complex than the simple theoretical calculation where the tension parameter is set as a constant.

The scaled tension you saw in the graphic is thus a compensation process studied with care by string maker in order to neutralize, string by string, the loss caused by stretching of the diameter in traction, once placed in the stable state of each pitch it will reduce a percentage of its value up to take a working tension equal to the other.

It will be realized, therefore, the condition in which, pressed with a finger, they manifest the same bending. In practical terms, if the treble experimentally drops of 2%, then in calculating the starting diameter will be increased by 2%, and so on with all the other strings.

But in practice the slope of the tension profile must be made even more pronounced: the purpose of this exasperation of scaling of the working tension is aimed to counteract more effectively the growth of frequency of strings of bigger diameter (the second and particularly the third) on the frets and acute sopracuti.

With the gut settings of the past a further accentuation of scaling of tension with respect to that necessary to compensate for the loss of a diameter it was not necessary because the strings of larger section were automatically realized with greater twist (are therefore more elastic), while monofilament plastics all have the same coefficient of specific elongation.

The measure – with synthetic strings- not proved to be quite sufficient; it often still requires a series of compensatory interventions on bridge of which the most common is the inclination of the same.

Take care

Mimmo Peruffo


For  further information:

 see our FAQ



aquila strings rubino series

A unique look and a strong, consistent sound.

Until now, it was necessary to increase a string’s gauge to reach lower frequencies. But increasing the string’s diameter also increases the internal dampening. That makes the string less bright, less responsive and more muffled:

the thicker the string, the duller the sound. Our revolutionary new approach —never introduced before us— changes the specific weight of the material, increasing it progressively to leave the gauge almost unchanged as possible is.

The result is amazing: the instrument sounds brighter, more powerful and more responsive through the entire range of the fretboard. The strings also maintain their intonation better (because thicker strings need to be fretted harder, pulling them farther out of tune).

Until now, this result was reached only with harps, where the scale of the strings is continuously varied.

THE RUBINO SERIES sets provide superior performance over traditional strings for musicians who love clear, sharp sounds and powerful voicing across the full scale of the instrument.

                                                                   You never heard a sound like this before, simply because before it did not exist.



code Set type Tension Euro excluding IVA-VAT-TVA (except for non-EU customers)
134C RUBINO SET Normal 15.00


Aquila Alabastro Chitarra Classica

Until the mid-20th century all Treble guitar strings were made in gut, a material that had been used for thousand of years and that combines good promptness of attack and excellent performances . A fundamental aim of our research has therefore been to design a new synthetic product having the same acoustic properties as gut, but without its typical defects (high cost, short lifetime, high instability under moisture changes). Our Supernylgut® has precisely all these good qualities without all these defects. Its features include promptness of attack, excellent performances and a truly remarkable stability of intonation under moisture changes. The Alabastro Basses, wound with high quality- silver-plated copper, consist of a Suprnylgut® multifilament core that ensures not only a high resistance to tensile stress but also a low absorption of both atmospheric humidity and sweat. Four tension’s sets: light, normal, superior & Mix, i.e. normal tension trebles and superior tension basses.

String colur: gut colour and pearl.

Please notice: Just like gut, the Supernylgut® is liable to suffer from cutting edges. Before stringing the instrument do make sure the nut and bridge are free from sharp edges and the nut grooves not too deep and perfectly smooth. You can get rid of sharp edges with very fine grit sandpaper (600, for example) or the finest steelwool (000).
To learn more about the New Nylgut: www.geocities.co.jp/HeartLand-Himawari/9169/genkonjaku3_E.html
Which are the performances of these strings? Hear here Stefano Grondona playing J,. S. Bach with an original Antonio de Torres guitar (Ed. Stradivarius, October 2010).


code Set type Tension Euro excluding IVA-VAT-TVA (except for non-EU customers)
97C ALABASTRO SET Light 10.30
19C ALABASTRO SET Normal 10.30
20C ALABASTRO SET Superior 10.30
22C ALABASTRO  BASSES Superior 7.00


Aquila Perla Chitarra Classica Bio Nylon logo

We are proud to introduce the Bionylon® bionylon the first eco-friendly synthetic string in the world. The first three strings are made of rounded, smooth Bionylon® monofilament with gut string colour – a new material discovered by us- that also boasts excellent acoustic and mechanical properties. Bionylon® is 68% a plant’s derivate; this allows a reduction of more of 50% of carbon dioxide emissions in the atmosphere during the polymer- synthesis than the other common Nylons employed for musical strings. The bass strings, wound with high quality- silver-plated copper, consist of a New Nylgut® multifilament core that ensures not only a high resistance to tensile stress but also a moisture low absorption. This allows a rapid and stable intonation under moisture changes.

ATTENTION: the lack of clear guidance from the client will result in the shipment of strings with TENSION Normal


code Set type Tension Euro excluding IVA-VAT-TVA (except for non-EU customers)
37C PERLA SET Normal 10.30
39C PERLA BASSES Normal 7.00
38C PERLA SET Superior 10.30
40C PERLA BASSES Superior 7.00

 AMBRA 2000


Up to the middle of the 20th century, the only available strings for guitar were gut strings for Trebles and silk wound strings for basses: their acoustical performance was different from that of modern Guitar- setup. The salient characteristics of the past setups were: a marked tonal presence, response and brightness typical of the top gut string (certainly superior to plain nylon and in some respects closer to fluocarbon strings) while the basses, on the other hand, possessed an exquisitely vocal quality, i.e. not so bright as, and with less sustain than, modern wound on nylon strings and more fundamental heavy. Our Ambra set was developed in order to best re-create, by means of modern synthetic materials, a different feel. This set was conceived for one grade of tension and consists of -gut coloured Supernylgut® for Trebles, while for the basses (silvered copper wires wound on Supernylgut® multifilament core) we employed a different balance between wire and core in order to obtain warm and deep performances


Code Euro excluding IVA-VAT-TVA (except for non-EU customers)
108C 10.30


Courtesy of VIKTOR VAN NIEKERK, ten-string guitar Yepes tuning Aquila strings

Code set tension Euro excluding IVA-VAT-TVA (except for non-EU customers)
92C 10 strings classical guitar baroque tuning ABCDEADgbe normal 26.80
109C 10 strings Classical guitar Yepes tuning F#G#A#CEADgbe normal 26.80

Aquila guitar string tensions (in Kg)

Note Perla (Normal) Perla (Superior) Alabastro (Light) Alabastro (Normal) Alabastro (Superior) Ambra 2000
mi 7.0 Kg 7.7 Kg 7.6 Kg 8.0 Kg 8.6 Kg 8.0 Kg
si 6.0 Kg 6.3 Kg 6.5 Kg 6.8 Kg 7.4 Kg 6.8 Kg
sol 5.5 Kg 5.8 Kg 6.0 Kg 6.4 Kg 6.7 Kg 6.4 Kg
RE 7.4 Kg 7.8 Kg 7.3 Kg 7.4 Kg 7.8 Kg 7.4 Kg
LA 7.7 Kg 8.5 Kg 7.5 Kg 7.7 Kg 8.5 Kg 7.7 Kg
MI 6.6 Kg 7.5 Kg 6.4 Kg 6.6 Kg 7.5 Kg 6.6 Kg

Aquila guitar string- gauges (mm)

Note Perla (Normal) Perla (Superior) Alabastro (Light) Alabastro (Normal) Alabastro (Superior) Ambra 2000
mi .68 mm .71 mm .63 mm .66 mm .67 mm .66 mm
si .84 mm .86 mm .78 mm .81 mm .83 mm .81 mm
sol 1.01 mm 1.04 mm .94 mm .96 mm .98 mm .96 mm
RE .70 mm .71 mm .69 mm .70 mm .71 mm .62 mm
LA .86 mm .90 mm .84 mm .86 mm .90 mm .79 mm
MI 1.06 mm 1.08 mm 1.05 mm 1.06 mm 1.08 mm 1.02 mm


Recent comments

Vi vorrei rivolgere i miei più sentiti complimenti per il lavoro che svolgete, e il senso di orgoglio che mi compisce nel pensare che un’azienda italiana lavori in questo modo. Ho iniziato a suonare anche grazie a Voi, e questo ve lo devo.
Michael Curry – USA
Alabastro, basses were nice and round, with plenty of edge to cut through, a very good string with lots of volume….
Nylgut- Extremely dynamic string, these are loud with better tone than carbon strings, all the brightness one would ever wantI would keep them on 2 of my 5 guitars though, because the grip on them is amazing, the unbelievable dynamic range, and they are warmer than carbon…. I must admit, I have been using very clear nylon strings over the yearsso nylgut was a nice in-between alternative, I think I will buy more in the future for sure..
The Bionylon felt great under my fingers, and I loved the sustain when I would do a glissando.
JUHA – Finland
Thank you very much for your kind support!!! Aquila has supported our events since we first begun and you have played a major role in helping us keep ukulele alive here……
Guys! I have just strung my soprano,concert and banjouke with your red strings, they are awesome! The sound is rich, the tonation beautiful and the low G for the concert uke is a wonder to behold. My instruments have never sounded so good. I thought my other Aquila strings were good…..but these…..WOW! My brother-in-law also plays uses and I have bought him two sets also. Thank you sooooo much for making these strings
Taro Tamura – Japan
I have web shop ”Spain Guitar Online Shop” in Japan. I have sell mainly Classical guitars,Flamenco guitars and Ukes. I am interested in your ukuleles strings. It’s fantastic.
Seoung Don Min
We’re so satisfied with your product.
Thank you for everything and honored I like this nice bright tone and rapid attack response.
also I think (as you written down the back of the pack) tone stability is quite nice
Salvatore Pinto – ITALY
…sono bellissime, grazie. siete stati molto gentili continuerò a usare queste corde.
John Kelly – USA
…I have used your strings for years and love them…
I recently bought a few set of strings from your company. I wanted to try new strings after being loyal to my former brand for over thirty years. I must say I was pleasantly surprised in your Nylgut strings. The trebles where very nice
Michael Malley – USA
…I love the low g red series for the Ukulele. On my concert uke it works great…
Mr. Clifford J. Lueck – US –
…just admiration for purchasing your Super Nylgut Ukulele strings for my 60 year old Mickey Mouse Getar I recently acquired.
I was able to achieve the required pitch and stability in seconds. That is saying a lot for a plastic Uke.

I will continue to purchase your strings for my 200+ collection of string instrument….

David Stanley – UK
…My set of Alchemia lasted over four months without losing their tone or their volume. That is a big compliment to the strings. Other strings would occasionally last me six weeks, other strings normally only last me about two weeks!
Oddbjorn Larsen – Norway
I got my Thunder reds for my Kala ubass yesterday. Put them on right away. Last night at rehearsal with my band. They all loved the tone, and for me the playability is way better than the standard strings. The deep E is loud and clear and makes it easy to make a statement for the bassist with a small bass. Thanks a lot
Castellaro Davide – The Utopia Custom shop – Italy
… In questo periodo diversi miei clienti mi chiedono i Vostri prodotti…
Andrea Pettinari – ITALY
…felice che un’azienda italiana sia capace di distinguersi per professionalità e innovazione, come Voi fate.
Ann Beckett – AUSTRALIA
It is rare these days to find the dedication to customers’ needs by yourself and your Company and I absolutely applaud you for this, not too many companies would go out of their way to help like you have, rather they would dismiss it as just not worth the effort….Aquila have just been absolutely outstanding in offering help….
Rob Wright – AUSTRALIA
…I also recently bought a set of Aquila Reds for my Kala UBass which I am very happy with as well…
Kreg Viesselman – Norway
My luthier, Leonardo Michelin-Salomon of LMS guitars, gave me a set of your strings to try on the guitar he made for me. Simply put, I love them.
…ok, your loaded long gut string is the best from long time.So am am waiting until you can…
Thank you for your wonderful customer service, I cannot speak highly enough of your fantastic follow up and I will continue to use Aquila strings and a lot of that has to do with the treatment I have received from you and your Company.
Andre Hendriks – NL
A ukuleleshop is not complete whitout Aquila strings
George Charalampidis – Greece
…I love the sound of Aquila’s Nylgut for Oud and I do not want to buy strings from another company…
Andrea Rinaudo – Italy
…mi ha stupito l’equilibrio tra bassi e cantini, cosa che permette anche di ottenere maggiori estensioni di volume con lo strumento, in registro acuto. Dal punto di vista timbrico poi sono davvero eccelse, nulla da invidiare alle…..   …le migliori corde mai provate (e non voglio far l’adulatore, non lo sono mai stato)….
James Everhart – USA
…I thank you very much for your service. As well as the quality of your product. I am a fan of Aquila strings for life.My ukulele says thank you very much! Have a Great Day!
M° Domenico Lafasciano
Ho avuto il piacere di provare le corde armoniche Aquila.
Ottimo prodotto, con perfetta intonazione, bellissima cantabilità, prontezza d’attacco,
fascino nel vibrato.
Inoltre la loro lunghezza e morbidezza, rendono anche piacevole il noioso lavoro del cambio
di corde.
Le userò e le raccomando vivamente !
Phil Doleman – UK
…Anyway, as a user of your uke strings for as long as I can remember (at least 10 years I’m sure)….I’m not asking for free products, simply to share the fact that I love your strings!
Toon Van Schuylenbergh – Belgium
Hey Aquila, I’am playing ukulele for a few years now and I’am in love with Aquila strings. I always use Aquila strings…
Steve Paull – Australia
The new Red Aquila strings have arrived.
I have tightened the lower G string up to the B above G with no problems.
Many thanks for your kindness and great service.
Julian Roach – UK
… After two weeks of playing on them every day I am still delighted with them….I find them molto cantabile, with excellent sustain, quick in their response and highly responsive to variation in touch. They bring a new kind of sound out of my Sakurai-Kohno, a very ’alive’ kind of sound. I normally play on D’Addario Pro Arte, which I regard both as excellent strings and good value. Alabastros cost a lot more, but I will pay the difference for their distinctive charm. I thought you might like to know that you have a customer in the UK who is very pleased with your strings…
Del Ventruella – US
…My first reaction, when I installed this strings, was to tell myself to send Aquila a message and proclaim the guy who came up with these red label strings to be a genius! (Probably tired of hearing that by now…)
Eventually I got my banjo tuned to standard G tuning….
I had to shorten a couple of the strings because of too many wraps around the tuner post, but now it stays in tune.
I love these Nylgut strings…
M° Stefano Aruta – Italy
… ieri ho ricevuto le 12 mute di AMBRA che avevo richiesto, ho montato una nuova muta e sento il bisogno di ripeterti quanto detto al telefono a mio parere sono le migliori corde oggi reperibili.
…il mio parere è frutto di una esperienza quarantacinquennale …
Innanzi tutto ho sempre insegnato ai miei allievi che la musica è l’arte di organizzare i suoni ma la matrice di tutto è il suono in sè come mero epifenomeno ed al di la di ogni banale considerazione su potenza , durata , sustain ed altre simili amenità ti ringrazio perché attraverso la tua ricerca hai ridato nobiltà al suono della chitarra , si vede che dietro al tuo lavoro non vi è solo una mera ricerca commerciale , ma un affanno teso alla ricerca del bello in modo da mettere noi musicisti in condizione di dare il meglio…
M° Massimo Gasbarroni – Italy
Come le accennavo frettolosamente, anch’io come, credo, tutti i chitarristi di questo mondo, abbiamo sempre avuto il problema di reperire delle corde di chitarra con delle prestazioni meccaniche e sonore accettabili.
Quando ero studente, fine anni quaranta-cinquanta ho provato anche le corde di budello e di seta naturalmente.
Ma se andavano bene per piccoli spazi non erano certo adatte ad una moderna sala da concerto, come ad esempio il Teatro Petruzzelli, 3000 posti, dove tenni un concerto senza problemi.
Sembrerebbe, a meno di un colossale abbaglio, che con le sue corde io possa aver finito di soffrire…
M° Marcello Appignani
I have tried a lot of different brands of guitar strings but I never heard a sound so fitting to me! I am an ”anomalous” guitarist because I play also on the piano so I cannot have long nails and with the classical guitar strings Alabastro I got the sound I looked for.
David Stanley – UK
On Nylgut strings…Many listeners have commented on their beautiful clear sound.
These are the best strings I have used in over 50 years of performing & teaching.
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